The supreme triumph of reason is to cast doubt upon its own validity.

The truth is that reason is the enemy of life.

Knowledge for the sake of knowledge! Truth for truth's sake! This is inhuman.

Man habitually sacrifices his life to his purse, but he sacrifices his purse to his vanity.

These terrible sociologists, who are the astrologers and alchemists of our twentieth century.

There are people who are so full of common sense that they haven't the slightest cranny left for their own sense.

Science is a cemetery of dead ideas, even though life may issue from them.